More broadly, some American officials argue that the reliance on Ahmed Wali Karzai, the most powerful figure in a large area of southern Afghanistan where the Taliban insurgency is strongest, undermines the American push to develop an effective central government that can maintain law and order and eventually allow the United States to withdraw.

“If we are going to conduct a population-centric strategy in Afghanistan, and we are perceived as backing thugs, then we are just undermining ourselves,” said Maj. Gen. Michael T. Flynn, the senior American military intelligence official in Afghanistan. …

The relationship between Mr. Karzai and the C.I.A. is wide ranging, several American officials said. He helps the C.I.A. operate a paramilitary group, the Kandahar Strike Force, that is used for raids against suspected insurgents and terrorists. On at least one occasion, the strike force has been accused of mounting an unauthorized operation against an official of the Afghan government, the officials said.

Mr. Karzai is also paid for allowing the C.I.A. and American Special Operations troops to rent a large compound outside the city — the former home of Mullah Mohammed Omar, the Taliban’s founder. The same compound is also the base of the Kandahar Strike Force. “He’s our landlord,” a senior American official said, speaking on the condition of anonymity.

USA: Rep. Jane Harman elaborated on her statement that further troop increases in Afghanistan wouldn’t be well received on Capitol Hill: here.

After several days in which US troops suffered their worst casualties in the eight-year-old war in Afghanistan, it was revealed Wednesday that President Hamid Karzai’s brother, reputedly a key figure in the country’s drug trade, is on the CIA payroll: here.